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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a2398fdb3c4a37f7f6407e0a0be5cd0d37a6b5c1f986c5996d8beb1f0f85a6df' 
  AND token = '7+XT6p6ORq2pjrQJlIwPHBwc4ANrHtQCxEOv646E6VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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