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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'c5944863f4946721e1eb3e3e3b2719a1b3832add1986b73262cbfb3ee0d28757' 
  AND token = '3uSLr+6xaUknuWcQvATWqlesDbtL9ZMDCfTdHKdZH5Q=' 
  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"
    }
  }
}