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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea2b5d5c5c22c83d94d593d7e4d99575e86d169abef00447955282f3a8caa6ae' 
  AND token = 'bi5JoOqXVYy6sjNuOYjnIOuUGqHVkt2O01M66auLSrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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