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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16b289e48ae3a35efaa070c41ed93020081cedb5906ea7f951599aaee05b6998' 
  AND token = 'gVqAyvjY1PLpAmZZd3Wdu6eRtjQau9wJzsaOx4ny0KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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