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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a27450c316ba2139f50f22dd3f7b0601703d35d50160b47f629f2ea48880501f' 
  AND token = 'BSm0MpqEacZQL45UFa+BVgOy37tbaxCD2VAdCqSYM0E=' 
  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"
    }
  }
}