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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a6a268f8abeeda6095e4b93b4ed142b14e55a9dbe3e4c96628dddd1e47e157eb' 
  AND token = 'g9rgbeVNcqNQlUBm/YP3gW4NG8xhr0MNLPp13zUP0tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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