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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695f1e16d0041a47400dcadf87059c2415de131c2d0664caa75bcdfa8066c59e' 
  AND token = 'p8uCADMoNIzh2v+YszKqA47RIN1Lj06ncGt3+zQlTlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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