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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '174cf37c1957c23de860863cd727a4bb8fc0693b9e3707ad57f93f7fa1d252fa' 
  AND token = '7cOENQP4PbeijzEX6cx07P8ux/fmNs93FKHCv2prImQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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