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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4994f0217343dfcabc6304961cd9e5be70b2736b8dfac3de65a48fd20d48ea57' 
  AND token = 'fJ92yb8se0GSVnwjpgP18l0sAFS2BpVXEDCo1Yzigeg=' 
  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"
    }
  }
}