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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c78e80b166a8fb7cd9c29d77f6b2268cc1a97707f542ce6100d6b7fa6ca06b09' 
  AND token = 'gDEQ/ECbSHnq6pYET0tU95GkjelKu7PTWzTwz8TO0d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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