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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a19632d2f38c53df59051a88cce7aa6f67bf21a40274d7db4a66c4551a896821' 
  AND token = 'gUDivQvDthFnQTOEgX2r6kSKEYm/FM6kUNITq7uz0dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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