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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '5f1464745ce1388eddb13cad3a3133f6554ad41b22b047ac704f07c943d43bc7' 
  AND token = 'nUDXSVriq78IQ1ZbRRNaqOfs6IcLZOIjUVYLA9kP250=' 
  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"
    }
  }
}