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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc55a60ae169ff02f649209f558ea9d1b3c54ddb92691d4bb7bcc5550568fe3' 
  AND token = 'CcFQmWVmLG/n3OzTaFuBn19J+lwyQ+cGXe75/SkJGQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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