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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2001164f12d2add235c5b5a09b0b06665b5f5b865da0ced88eab1c3c42ff6034' 
  AND token = 'sXGy6krCZh60RcAt8uLv8hWybcb9WHDGN+7rDcVJjag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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