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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc96e1a08c7ddede62d6bbaeac548d6f4193808a9857c64a23826e45d4dcb434' 
  AND token = 'Pw3Q1ZBqPqktivGalTADV6a7VUDuf5oL7NkQJJLcaPM=' 
  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"
    }
  }
}