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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd72011b43baa3a7ed4a5bc3aef8a5e71f769539a320d4786ca250137a40a8234' 
  AND token = '2bM7ib7Ai2HV4wBUTrYdcUeK6YXH0A1e5nalDtR99aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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