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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '319acf8343a95acab556428c04088f23f81df34c13520aaa93d8e05feb04e4d6' 
  AND token = 'A9kwL7XLNVQPRy3kLm6QTc1B1Bf4E3qswtja5jmLePA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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