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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052ba4c8c774572aff0b131b7c6aee68103e526d1f37f8c799a28dc58cc0049d' 
  AND token = '2/CaQ5w9Op1ZylYCpGrNrQaeRZ+TXHG73XbkKAHVR68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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