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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a648a46ec5300f9cf071018b0763cf42310fa650611241564cbef9e465643059' 
  AND token = 'y90BjR2ThBEzzjwOD4JDN1aHM2A8GN90Yces/Shon6w=' 
  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"
    }
  }
}