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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'd289700259a738d0462329cc7824433eda9041aa434652a069fcb57508b41b4b' 
  AND token = 'mdWEbyn4efTguYvfIA+0JhhwoXSkI75MLObiB1FRegI=' 
  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"
    }
  }
}