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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0caf49d39deaf28f086aa359d73480c8acd654779edf63681c1c23eb8e6b60a3' 
  AND token = 'Ix6NeVveC8hgRV0kpyKJ4z2M6ToKJSJOr9+X3pXiP3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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