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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '89174f621609aa35842eeb9ee0c5bb3ee13cd8bcc572619e3785843968a76e25' 
  AND token = 'KrLZGhpDH5rE3MObNXjjiNkn1GPnUADyNNM11Ex6PRg=' 
  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"
    }
  }
}