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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8ad654818da408b83c2b03605dc91d8cbff0cc9ce15223d58b273a7e1abc46' 
  AND token = '8vR+00s0EOg7qKmahGC3Hs4wMBd2E+Tn4pWT1CKOGnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}