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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5decb57d85f4768ea77da5a78ee9f85f0a056fecc5fd0f26aa52999c1a471631' 
  AND token = 'D4TFzenmT83bjTdry/EjvG5Zt31F+b5GmVVdyu0+XME=' 
  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"
    }
  }
}