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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '6608eb264fb35b4649fa699b6d4a86d33c8afdd3ec6ac1037e8465014d602cda' 
  AND token = 'AAIedgmzftipgCZtOsK/lj2AnUZdFjtRhi/e6eD74Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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