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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '9f5be856e4bfb165669e4ea65b8124ad3235f6aada25e0223e983690f40bddac' 
  AND token = 'd0JWV5i4xUHfYTPhHjbDc1dmxqcPwPADU6viW4ZxvQw=' 
  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"
    }
  }
}