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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41935d072030a2dc354376d2fa5930597aba08b5a715d7fe1237882e49040acc' 
  AND token = 'uhbvHBcPeGfA17FeKuPnojNhdmNy4bN7yxLzzvi8E0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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