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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c3eea9f58a377fbff7c038e2f3014d80175936e80b026e6afefe23dafd5cd676' 
  AND token = 'JmzpQpQOMqd4FAGQ9FJ47PQU6BfvsANLthCCnr+5y14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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