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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b5b98211b6e21f5fe4dc08191cafbec8c0a2b9eabcc282e95829653c6f1360f7' 
  AND token = 'aBvkXQX0Q8etlZ3SAJ75thWBqaZiBxajLZpLiYJ9O84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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