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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f4c7545609433c4aa27c5bf4762357b4b92aba20c2184c15f41997a33a3715b' 
  AND token = '3KV7P1aaQnZXoc3aPZM1/vjOTA+OPLqPUdEq8V3gDHI=' 
  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"
    }
  }
}