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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '976531930023655e19834792e090a6a42342b3bc7d682072c02c6472efc733fb' 
  AND token = 'XEh8ZZKoRD/di4Zb7CIV1vbd8xFQ43MOiZ4aSLw0juo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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