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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5405a8fe55b15c72adf0a84264cb4557989e617fed28103afa1063ee570d6b2' 
  AND token = '4/YK3YBnjtC0hEzSxdWOgnQUSFaWanUOfKYg4lgKHfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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