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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9334a46923670bcbb96809d6aa3228b7cd7df5bff4c58ee0c3a12569a7c456f6' 
  AND token = 'yRykQagEQGVxaVpw+S/PQkvW6prWf2lRblqb1AaM8x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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