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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b731e4db376b442ce514caf5eafca7570157b8cd447b348632a8f895b2106f' 
  AND token = '/nTxawqlo/kh9iCj8xVaReTK3a085ZigmWu3DyASOos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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