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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5ca4fa2e16718b7e74cab38ce0fb3e082f8b299ecafd0fc26824cab77f12bf' 
  AND token = 'Kf4CT4tccjYoDb5WJXRr9iIAgjqN8jzf7yHTjW9MQeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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