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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9abcff347198721f85909ebc31fda68ebb0ada27cc0a7df9b2006b7d901425f7' 
  AND token = 'Gk3dMlkSDPDZcxlHcU6+sk0Gms3OWISvRvWW7mx5s7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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