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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78fe8cd688201e1eedb6c94d1064d74bb0b5784b6a157d9775266111eda862fc' 
  AND token = 'k9Yvd6BvdG8VzLyYc5IQraorzuXNFkdRP2cKBiNUvpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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