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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb7fbb0fc5ea981832608e26a30d76a18ed21cb79e1b322e8f3be7999b30ad5' 
  AND token = 'mXwRpf60x+YcWvoF8GnocKM7Ni6Y8sXIvLSaPmGsvrA=' 
  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"
    }
  }
}