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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '629ce560f37ddfed5b16e2b49b8d1e6fbbdeb944e3404e6f4f9adcca85ebb7df' 
  AND token = 'B1ctLt5Y3E24I10E8pmYYqKeN96gPLBmjRreQH1iH6g=' 
  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"
    }
  }
}