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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367c26d471128add28cdee3beff58c7ca752b06aab7cdccd5756c3c55cc82999' 
  AND token = 'zlzEqbX0WcFJfZ871oG/Yuu+FaBj5/b/ye3k1d/pvLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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