SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '7bf7d3d6ecc8036e247bfcb070d8b3752ddd41328b619c52088a2f425ee8cc34' 
  AND token = 'TQAyCmhsT6pSNnMuHyFqiM+X/OB5Xv9Tzm6ojWODv6A=' 
  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"
    }
  }
}