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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d17f0a375387536b60d0f8215ea3d5c0964e38618c1a36a1cc4c4c388b550c2' 
  AND token = 'UrRRRN6lNRdz8c6aJXY4euU/7x43xSBg2GSgD9T7V8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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