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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '6c55c0a9c7208f5f0622b642935d3fed3fa463e939575f5086c0f855f85b50ff' 
  AND token = 'd7xorjbfSLfRQXtRLTl8fWgcHoAg+JUXDQmhFou8iX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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