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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '9b58e56c8f5c3db42cbb3917577281593d1ae15bb59e7cc3c7a98a723c1c1621' 
  AND token = 'PyXPXksmRF4Xqd/2bHmEdWYdgGr9sL13IY5lqiy1qgE=' 
  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"
    }
  }
}