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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '316f80dea06cbea01edc22430709b84afe2e3d3e9ee7a73236d7b1da4a83d201' 
  AND token = 'DWagz2uh8ccCiClz+OPRddYMIr2ZH4FIUMrLBvntj/o=' 
  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"
    }
  }
}