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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'be1b7dbbd91380e6d85e75d6108e83175203d7cf6d44a9552febfcfc6755049e' 
  AND token = 'g8cqMHZE7S9rJ/RU60P/05tNS9Thgto1DW31na7ZIz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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