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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '50d1fa3273408cbaa9e2aaa2d438694c62d537d047f4ec007b374f2e112fb9ad' 
  AND token = '8rpCNAzoO0nyRK33dMu8nUUVFgfpgM4+OS6TrWP4G/Y=' 
  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"
    }
  }
}