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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41dd8ad409daa02baae607a220f83b7c117b64e1e47df94176cbadcb89d63e75' 
  AND token = 'N2meMs6lE0qx3xOfOYRGQ4I+G9r86O5eDiDcn4HBoZA=' 
  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"
    }
  }
}