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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f03fb7ca515c32cd77e340363ded81dded1c22606d5d5e209d2d59b6e1799264' 
  AND token = 'BD3UfMhG5TwV+Vyr/t1Nb3jpuylFdmMggitKsMVtFqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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