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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb34a9f606445dd710591010a0e7b2224967cb5cf82ac2f8488f4bc218ec6c0' 
  AND token = '8Swfrxsf+dfwujLanLRpRpEl16K7//+1MYs6oivRsjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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