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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcdece0c302ad40832622d0f6d03d30f4967d9bda7aee6205c083dad9143d82d' 
  AND token = 'Jn5tbW/GGWXfu7ZNyInFKVuVEmi0LYhUn3++BWwrHks=' 
  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"
    }
  }
}