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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '87ddf204471a6f13521067157b8cc874210001b9f269a9e9ec9243c098d7286f' 
  AND token = '6m31gnvkImAMMz7Ez24/W0m+w0Ou0uEK1vmLr0x6aaQ=' 
  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"
    }
  }
}