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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dba02513df6e85f44fff5f05bc18abe96ba4e009185cbf0a180b3b73d89f2fe' 
  AND token = 'h5mr6YhL0a+WspI8EWHtTm+pYOhq9pdkozXH2PwfKTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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