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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '123ea7dbc625bad8464f23d1807df95637ce6b155f8438d6ae142dd8f7cf4409' 
  AND token = '9eBp7uwxmjgCWRFHEqzLN40EtD4TEFlB0uf7Uua0uB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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