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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713edb806eadfd7936ac497700adae7874aecce7c984880210a5a54da766b297' 
  AND token = 'g/fNLesG6HuUn2TsBI4T2SI5jYvUsTJPhq+P6xP7e50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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