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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a2603dd4474685d86916a97fc6807b15b49668a9ab60d02aab9f7b1ed85bf5b' 
  AND token = 'kl1zNM1vuecIdNa5FH1T9rlVJwT8xtCbR1V6Q8WtW6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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