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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a7d5bface5440b835a8d519ac35fc7e9360e7112cc520a7a5e573a4a33ec244' 
  AND token = 'bulWaQuy98hOBQhAXw08CjE12xbhi37KgWQkL7ZyKhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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