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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003204d6626d7716862b9bf1d806561f8dcb7e3ac8194f392fb4b1e4b6ed5d4c' 
  AND token = 'TKk1ehDgo+y5+lFx/jiOL5YP71Um3iwa4jAMq4dXwpo=' 
  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"
    }
  }
}