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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b3abce1605e0d59513e85bb7ef6b65702f4375b8660785788510b7e126b172' 
  AND token = 'jYobUrbcYpDa8OMMtxR83BXGUrByH94Nn/S1cD3+nMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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