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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2e34025aea42bb71a220d3b8633cfc1ec37a41cd51dbcb81a771001856fce5' 
  AND token = 'CiLG9OsiMjSJ6kF9MBnK20R2giy6+cz2GTeAjea1DII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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