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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '1a75bd9f13e34f4d6a84464d2dc41b7f00d01ac6dd7250e6ffb740f309ac085d' 
  AND token = '397aDNiHB8dBmKsW8EAC9EiTt91Kwcq1z9deiLcKEVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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