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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '990b2bf5139f2ef6d6183aad0e341c62a55feb8c6f1ad649f34af6efec81987d' 
  AND token = 'yHm+dk9wiCMFoyNeltgA0JlgYbekHS0YlHIV2aCqexg=' 
  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"
    }
  }
}