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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce7a0c3437b6fc3f634493f9d16929dafdb363b105d42b2a588ee1657b65165' 
  AND token = 'MrN8Q9kZoFAaO0htb2gzJ4IVE5bO48dITARPO973lm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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