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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c20ff62fb0991ec1c237787f34e10c5a17ac9e0bf3b4b967641ed4d3aa681fa5' 
  AND token = 'kENZK2OUlP9xxvnYoN+8Fm3pcoDt/SHrkVfrxabSO4U=' 
  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"
    }
  }
}