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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67f527072f4ffd174a0b5e187d728aeb45efa1685d7bda45ca68f30781477c8c' 
  AND token = 'TdOrQZ7bSFjm9vXWaIi4j4jh0pfrVYZRrolF6inBmYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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