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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a713ba6817921c690e0995c94efbb3e2c3119ca4ff06c202b6e3f2ebfea7b378' 
  AND token = 'feWpR9+zV4QFsQMn9611A9tsA41y83q+Y1kg1nCJQ78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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