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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa00a6c10b2e42961a05d185ddf87c4f4779f6da751944e95cc5a46019afad1' 
  AND token = 'oDYO3F0FLe//4D69ojNfPAU0Snnuo+2FQXVO9aPWI9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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