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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d18e1e90e685cbfd9e3ae9281a36f34173d787c472563ef50f587933b752812' 
  AND token = 'AjMUKs6HVxdFoNIjW3I6jGYucc5g8owTtuAgjae5n5s=' 
  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"
    }
  }
}