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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c9346551e9e5271442db04462088f5513146d8f54f328ccb221e02b5e9934202' 
  AND token = 'eUWc2mpIJQsZedbvfqOjhSk1Udg+Bdrhu2olGwQUHw0=' 
  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"
    }
  }
}