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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed17f64f167f66956da4466373c9f31773f4ac09e74eb0d39bba358366c6c431' 
  AND token = 'lYOtpw4CbF0U9Eja2/aYU8oqIw1eI+D5uXqngUBlTqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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