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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe28fda25859a23d083645e64c4698ad67cc23ae599f2e8c9ed271bd2a5f11c' 
  AND token = 'uwKk3jOjWhHiNzj3TSMVMUzIjW06saaPMeLnoa2G18o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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