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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c2e46e2bb3deeff4d9fa28eeb3094c15fd18b783357a69908185c5352509561e' 
  AND token = 'n5XkPXLDh+S5nHfxHwLPKAwZA5Gbb0vsafX/ngLb4ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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