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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '509735ed7edaa03023bfe1918d60ba0776cf954ae4040acc91de4fd053a3d52a' 
  AND token = '13/6ooM1I9jfbV/cOP90eRhhmTJY8bvVy8G5Vi/tYyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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