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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7f1b8ee64afce6889617015a35368e903002ccf3e6a784c9e1a38e13ab25c56' 
  AND token = 'yMH1PnpGQZJDhz7xHSGz1zSx5x9d6OF8YNviN+geetw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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