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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'e67b0a6869f8b2fefe5d655ed9bc5b6650ee80d7817c452634b127906a3298a9' 
  AND token = 'Vd+eIycz7Fa7Iz/os2vB5zFvkESO7rghxsIKRHpIfjo=' 
  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"
    }
  }
}