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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5faf44fe7366babe0b44b9b97a7816b50602e6abb63836a46e61298373c6e180' 
  AND token = 'SMx9XHcLBwYfCeJNwgsSDJ2yaJC+6pwNv4O0KNNnqBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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