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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cef979c906ded9ceed92b96b1a18dcfdf0047ee5db2d9cec6cd3ff09740e0a17' 
  AND token = '/IFccVmAy3TpfI3s88VFZ296Mgui8uoNHF9ztHrkRZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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