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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '704193cf07c01bcb22045bc3bd9c1bb3b6a4828684ec0f0efebb63c6fb39a11c' 
  AND token = 'OCl9g3V4YtC737JLsb3Qrnfz1cHFWZm5HuqloV0tsaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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