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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'ab1e2b61260d30f0bb9ebe49a53a4cbcccee964bb823d6c08c66dc195cf88224' 
  AND token = 'coSVksO3GwqvyKjwvyZ9ORi3CnjbFxQ13WucJFzyB+o=' 
  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"
    }
  }
}