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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d0f95459997006b914e7a6e08a822c2c2824745d642ac246f7afde23165ab0e' 
  AND token = 'BO3GJ50wK0jgeHTIQtyceJ1/9C/qMNlGmGX/JucJL1E=' 
  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"
    }
  }
}