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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b8e00ccae2063f1fd74a055979320f686abb3a0a390a9b508edbc73ec5c65ce5' 
  AND token = 'AClPva36MAMPhlbAOhwgpSzb2QRA1hOzN1Lriyh0NPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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