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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '27b6d2a9b2cd206b744867f8b895a819e1deac3ed922917752692da72f77b02a' 
  AND token = '0D8yTRKkzm12YKCWp05ZjBByTvWvWWVoHRJoEdqVfN4=' 
  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"
    }
  }
}