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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d2e11e727ae250540f8df4f5ee4c26d1d69757bfcf7be26ccb0afcc33745534' 
  AND token = 'MhuNf2BntP3xULwsg/Jfbbe/NKDOturkXO1gqB1g34I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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