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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '7b4ad62e527a01510d7cdd2067edfce7d29678980d9666c5f822b27ac7560380' 
  AND token = 'IIegNF+bWVN9ybCLCUqiaqDs0xAm+EcPhP6q68RojQw=' 
  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"
    }
  }
}