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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '14992191ed908a0dbe42de03fe42cbdc0cf992f67bb7f6f86ee9ddf6092a95fe' 
  AND token = '0LhH2/vZxYlYFLa+TbQU/eqtxGOp6iDadl48hQBn8M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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