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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b42ccf27d91da5162ce8567faa3ee2c7ef8b15b7e7fb62797e614b38fe2c880f' 
  AND token = 'rwe1a7u6oogHr8lSe7jU9Xhj482IiWzmRDP2dykJlEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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