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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '930782a30577699a52edf53be3afbb27f58585a58fae01e375d565ce50d1c1ef' 
  AND token = 'IF8ahT9O2Hz4Znn/yh5LMtm9Pt9DWzO4FpB7eS2H6Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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