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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2b2697159578eaceac9436da2c81ce4b6199a7480b20ae110adab49f5294ce4' 
  AND token = 'idQsEMDXxobR4k4nhi52H6l1ZOH67848d4wTohkXXOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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