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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b6e2083db24170076adde77550d6679434538e05aeb963b7c7df92dcc4722c4' 
  AND token = 'rV3ciHB677z/XRtbZ7133dUZExocWrvA3VmoFWfRqRs=' 
  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"
    }
  }
}