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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf37f2910844f585181b2b2b8bf87bbdefbbed8647f73ffabc88c02c303ed1d6' 
  AND token = 'C36zHWbSj3HMD0pTXyIfewlHzbvxeweIobDu9y0XNFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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