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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b8f3230a49dfc46e319e958f10ebaa84a429e704d58d0b85d39d875323695aa9' 
  AND token = 'TbHFbIOkhOTP5pRnJYW65U+dmsnBnO3XJmxSo+zbr8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}