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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b46a8a373057d142deff1e9762021c81ad5c588677dd6fc821e04231b00f028b' 
  AND token = 'fk5FcK4ekaFSmvlxNI4IGEaFSXoaE5s/AXASQ454yCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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