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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3f812b394670820a6bca35e1f43be0ba371c495a3e60559a14225edefcbc45aa' 
  AND token = '8AYcB7ge44UaQdc0eXsuGrPRpUCH4EbWyZT+WehQCMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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