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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17603cc5b5188e476e38dbea3840aa2831d06be88ab36aafa89bd22dae7b528' 
  AND token = 'vRqLrJrnsBaS2SPMoX6EII3D3RX+qG5yBEUo3vBxCSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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