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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a7c8a9deaae08ce941f3cbab1d670a5e7c2789fd088d843f31a19aa63c3ecd02' 
  AND token = 'hYBlOxJVQ58Pdwz4zvRuc5zEzdWqvIvpa+8gnLn6enA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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