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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7054163dab36728bca0120f2d6ee3454c90eb0fafb064fcf123aab461e5ca0' 
  AND token = 'GSm7aEwv/XWtWJJ8kpoupZQ4Knr1OSEqRdkg7Pbzu6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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