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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3c485334ec8dbb33531cfd4c46ba3c8a2c6d84d45f301be9d0f99cea37b246a2' 
  AND token = '6Btd+mSHCAsb2ggaHUZPi3sqQc8VkESGy2boiWlVAUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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