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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee62acf45e5c130741bdaa3e4616b1d971fca225da020be09dc4d34b3cc886c' 
  AND token = 'Px/wIZ7fJkGk3aPBXhaG8tOlpRh4mqSSW70ugF/ir14=' 
  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"
    }
  }
}